**Hugo Modules** are the core building blocks in Hugo. A _module_ can be your main project or a smaller module providing one or more of the 7 component types defined in Hugo: **static**, **content**, **layouts**, **data**, **assets**, **i18n**, and **archetypes**.
You can combine modules in any combination you like, and even mount directories from non-Hugo projects, forming a big, virtual union file system.
This is all very much brand new and there are only a few example projects around:
- [https://github.com/bep/docuapi](https://github.com/bep/docuapi) is a theme that has been ported to Hugo Modules while testing this feature. It is a good example of a non-Hugo-project mounted into Hugo’s folder structure. It even shows a JS Bundler implementation in regular Go templates.
- [https://github.com/bep/my-modular-site](https://github.com/bep/my-modular-site) is a very simple site used for testing.